Telephone receiver



Patented Feb. v24 1925.

PATii-:Nfr forrice.

AXEL oaLING, or mNnoN, ENGLAD.

TELEPHONE RECEIVER.

Application meaccmber 12, 1922. serial No. 593,950.

To all whom it may concern.'

Be it known that I, Axnr.. ORLING, subject of the King of Great Britain,residing at No. 47 Victoria Street, Westminster, London, S. `W. 1,England, have invented 4new and useful In'iprovements in TelephoneReceivers, of which the following is a specification.

This invention relates to telephone receivers and its object is toenable a very cheap' construction of telephone receiver to be made.

I have discovered that a diaphragm of 'a telephone receiver, instead ofbeing a separate plate anchored around its periphery,

may form an integral portion of anotherstructure, such as the cover ofthe casing or the casing enclosing the receiver bobbin.

Hence, according to the invention, the diaphragm of a telephone receiveris constituted y the plane portion of a shallow cylin- "drical sheetiron casing, servinlg either as al 'cover or 11d closing a shallowcylindrical rbox encloslng the recelver bobbin, or con--4 lstituting theenclosing box itself.

Telephone receivers according to the invention are illustrated by way ofexample bn the accompanying drawing, in which:-

Fig. 1 is a side elevation, partly in section,

"of one form of construction.

Fig. 2-is a longitudinal section of another form of construction.

Fig. 3 is a side elevation of a further modification.

Figs. 4 and 5 are a longitudinal section and a sectional planrespectively of still another modification.

a is an ordinary shallow stamped tin plate box, having a s oulderedcylindrical -portion, over the portion of reduced diameter a1 of whichfits the stamped perpendicularly flanged tin plate lid-b.

a is the receiver bobbin which is contained in the box a.' v

A wide hole is formed centrally in the base of the box a, and the bobbinc cony tained within the box lis secured by a screw d, constituting thecore of the bobbin c, to a magnet e.

In the construction shown in Fig. 1, the magnet e is a bar magnetextending axially from the box a, which latter is magnetically,insulated from the box 4by brass or other nonmagnetic washers f, g,bearing one on each side of the border of the wide hole in the base ofthe box a.

The leads hcovered with small rubber tubing i to protect same are ledthrough a hole in 'the box a.

After assembly of the various parts, the lid b is point soldered orotherwise secured to the body of the box a, to preventtdisplacementtherefrom. The correct degree of separation of the core al of the bobbinc from the lid I) of the box, which lid constitutes the telephonediaphragm, may be predetermined, for instance is interposed between theend of the core d and the inner face of the lid b, and the latter isfitted in tight contact with the paper, without however distortion ofkeither the box a or the lid b. Then after the lid b has been secured onthe box a by soldering, by pulling the magnet e, the core d attachedthereto is drawn slightly away from the lid b, the base `of `the box abeing temporarily bulged outwards, allowing the piece of paper to dropor be shaken ofi' the end of the core d. On relaxing the/pull on themagnet e, the core d, owing to the bulged base of the boxa regaining itsfiat condition, approaches the li'd bbut is separated therefrom by theamount of the `thickness of the previously interposed piece of paper.Thus a definite degree of separationof the core and diaphragm isassured.

Instead of apredetermined degree of sepa- I diameter than' the insidewasher f, and between the peripheralv portion of the outside .washer gand the outer surface of the base of the box a, a packing ring j oflarge diameter isv interposed..y A vtubular sleeve of smalldiameterencloses the bar magnet e vand bears by one end againstthe large outsidewasher g.y lThe outer end of the enclosing sleeve c is closed by a smallwasher Z,

and a 'screw m passing"throughthis latter Y washer screws into the outerend of the magnet e' which terminates short of the `washer t'.

On tightening the screw m the magnet e is drawnjtowards the outer end ofthe sleeve lo vand bul 'ng outwards Ithe base of the box a, within t earea. enclosed by the packing ring j, withdraws the core d and bobbin cfrom the lid b, which latter constitutes the diaphragm.

The constructions shown in Figs. 3, 4 and ,5 differ from that ofFig. 1solely as regards the shapes of the magnet e.-

In Flg. 3 the magnet e is a horseshoe magnet extending laterally fromthe box a. One pole arm of this magnet is secured to the core screw dwhilst the other pole arm, which is shorter is bent round and passedthrough a hole in the side of the box a terminating short of the side ofthe bobbin c.

As shown in Figs. 4 and 5 the magnet e may be coiled and containedWholly within the box a, with one pole secured to the core screw d andthe other ole is magnetically connected to the base ci) box a by ariveted iron Washer n.

Obviously with a tin plate box, thc base of the box instead of the lidmay constitute the telephone diaphragm. Also With a tin plate lidserving as a diaphragm. the body of the box need not be of magneticmaterial, and may be of non-magnetic sheet metal, wood or other suitablesubstance.

I claim:

1. In a telephone receiver, a bobbin, a core of said bobbln, a sheet1ron box enclosing said bobbin and core, a magnet having one poleconnected to said core and the other pole in magnetic proximity to saidbox, and a sheet iron perpendicularly anged lid of said box including adiaphragm in magnetic proximity to said core.

2. In a telephone receiver. a bobbin, a core of said bobbin, a sheetiron box enclosing said bobbin and core, a magnet having one poleconnected to said core and the other pole magnetically connected to saidbox, and a sheet iron erpendicularly flanged lid of said box inc uding adiaphragm in magnetic proximity to said core.

3. In a telephone receiver, a bobbin, a core of said bobbin, a sheetiron box enclosing said bobbin and core, a magnet in said box having onepole connected to said core and the other pole magnetically connected tosaid box, and a sheet iron perpendicularly flanged lid of said boxincluding a`l diaphragm in magnetic proximity to said core.

In testimony whereof I have signed my name to this specification in thepresence ot two subscribing Witnesses.

' AXEL ORLING. Witnesses:

R. A; SMITH,

RoB'r. A. BLAKE.

